Try this it worked for my ath9k it was getting too much juice and causing 
problems set it to whatever limit comes up as your power limit when you type 
into terminal  sudo iwconfig wlan0 txpower 8B26
this made it run significantly faster I also tried some other things so maybe 
the combo of things helped such as changing the dns host file but good luck

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https://bugs.launchpad.net/bugs/754176

Title:
  ath9k wireless connection extremely slow

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